Hot-air furnace



c. VAN GENDEREN Feb. 28, 1928.

HOT AIR FURNACE Filed April 51 1927 I fatented Feb. 28, 1928.

UNITED s'rA'rss CORNELIUS VAN GENDER/EN, 0F DENVER, COLORADO.

HOT-AIR FURNACE.

Application filed April 16, 1927. Serial No. 18%,303.

My invention relates to improvements in hot air furnaces of the type used in heating dwellings and other buildings and its primary object is to provide in a furnace ofthe above described character means to promote the consumption of fuel in the combustion chamber andithereby reduce the waste of fuel and heat by imperfect combustion, and to simultaneously eliminate from the circulating air, foul gases liable'to contaminate the air in the rooms'of the building in which the furnace is installed.

The invention is particularly adapted for use in heating systems in which the air circulates through the heating chamber of the furnace and' the building without direct connection with the outside and in which purification of the air is therefore of more than ordinary advantage.

I attain the above stated object by provid ing the space of the furnace beneath the grate of the combustion chamber, commonly known as the ashpit, with one or more air inlets which open in the chamber or jacket in which the air isheated. When the air enters this chamber, part of it is drawn through the air inlets into the ashpit and through the fuel in the combustion chaI I1-' ber thereby providing additional oxygen required for consumption of the fuel, and'inasmuch as the foul air is heavier than the purer air which rises more rapidly in the heating chamber, it follows that it is thisfonl air which enters the fire so thatthe air inlets not only serve as an aid to perfect combustion but also function to extract the foulest parts of the air before it is re-cir culated through the building.

An embodiment of the invention has been illustrated in the accompanying drawings in which like parts are similarly designated,

' and in which nace of conventional construction, including a combustion chamber 6 divided by the grate 7 from the ashpit 8. The combustion chamber connects as usual witha stack or chimney 19 and it is surrounded by a shell or casing 9 which provides the jacket or chamber 10 in which the air is heated.

The air enters the jacket at the bottom portion thereof, as through a fine 12, and it rises in the jacket to enter the pipes 18 which conduct the heated air to the various rooms of the building in which the furnace is installed. v

The air inlets hereinabove referred to are located at opposite points in the wall of the ashpit as at 13 and they connect with nozzles 1 f which curve upwardly and then downwardly in the heating chamber. At the I end of the nozzles are pivoted dampers 15 which may be opened or closed from a point outside the furnace by means of chains or cables 16 supported on sheaves 17.

The object of curving the nozzles in the manner shown and described is to prevent ashes from entering the jacket and to pre vent gases of combustion from escaping into the air passing upwardly to the heating flues 18.

The dampers in the nozzles provide a simple means for controlling thequantity'ofthe air drawn into the space beneath the grate of the fire-chamber, in accordance with the nature of the fuel used and other variable conditions.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1 1. A furnace comprising a combustion chamber and an air heating chamber separated by a wall having an opening beneath the grate in the combustion chamber for the passage of air from one chamber to another and a nozzle connected with the opening, the nozzle having an'opening in the air chamber higher than the opening the wall.

2. A furnace comprising a combustion chamber and an air heating chamber separated by a wall having an opening for the passage of air fromone chamberto' another, anda curved nozzle connected with the openingf'the nozzle having an opening in the air chamber higher than the opening in the wall.

3. A furnace comprising a combustion chamber and an air heating chamber separated by a wall havinganjopening for the passage of air from one chamber to another, and a nozzle curving upwardly. from the opening and then downwardly.

so i

In'testimony whereof I have affixed my signature. I

CORNELIUS VAN GENDEREN. 

